کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5420979 1507517 2006 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-field QCPMG NMR of strontium nuclei in natural minerals
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
High-field QCPMG NMR of strontium nuclei in natural minerals
چکیده انگلیسی
The only stable NMR-active isotope of strontium, 87Sr, is a spin-9/2 quadrupolar nucleus that has a low gyromagnetic ratio, a low natural abundance, and a large nuclear electric quadrupole moment. In this work, we utilize the quadrupolar Carr-Purcell-Meiboom-Gill (QCPMG) pulse sequence and a 21.14 T NMR spectrometer at the Pacific Northwest National Laboratory to characterize the strontium sites in the natural minerals strontianite (SrCO3) and celestine (SrSO4). QCPMG at 21.14 T was found to provide sensitivity enhancements of roughly two orders of magnitude over Hahn-echo experiments at an 11.74 T magnetic field. We extracted the quadrupolar parameters for the strontium nuclei through iterative simulations of the experimental spectra with the SIMPSON program by Bak, Rasmussen, and Nielsen. The data show that the quadrupolar parameters of 87Sr appear to be highly sensitive to the symmetry of the strontium coordination environment and can thus provide information about the strontium binding environment in complex systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Nuclear Magnetic Resonance - Volume 29, Issues 1–3, February 2006, Pages 95-103
نویسندگان
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